Processing /etc/letsencrypt/renewal/cloud.moulard.org.conf

Cert is due for renewal, auto-renewing…
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for cloud.moulard.org
Waiting for verification…
Cleaning up challenges
Attempting to renew cert from /etc/letsencrypt/renewal/cloud.moulard.org.conf produced an unexpected error: Failed authorization procedure. cloud.moulard.org (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: query timed out looking up A for cloud.moulard.org. Skipping.

All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/cloud.moulard.org/fullchain.pem (failure)
1 renew failure(s), 0 parse failure(s)

To fix these errors, please make sure that your domain name was
entered correctly and the DNS A record(s) for that domain
contain(s) the right IP address. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you’re using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.
root@cloud:~# dig cloud.moulard.org